Journey AWD V6-3.5L (2009)
accompanied by increased fan noise, the proportion of recirculated to outside air, gradually approaches full recirculation over a broad temperature
range.
The front A/C-heater control utilizes integrated circuitry and information carried on the CAN IHS bus to monitor many sensors and switch inputs
throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater control allows it to control the electronic
functions and features of the ATC heating-A/C system.
The inputs received by the A/C-heater control of the ATC heating-A/C system are as follows:
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Refrigerant Pressure
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Evaporator Temperature
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Engine Coolant Temperature
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Ambient Air Temperature
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Infrared Temperature Sensor
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Vehicle Speed
The messages broadcasted by the A/C-heater control of the ATC heating-A/C system are as follows:
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A/C Request
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A/C Select
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Rear Window Defogger (EBL) Request
The A/C-heater control for the ATC heating and A/C system is diagnosed using a scan toolSee: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
Prior to replacing an A/C-heater control, check for any Diagnostic Trouble Codes (DTCs) related to the heating-A/C system, and run the calibration
procedure to verify that the concern is not an air-door calibration issue See: Testing and Inspection/Component Tests and General Diagnostics/HVAC
System Test.
The A/C-heater control cannot be adjusted or repaired and must be replaced if inoperative or damaged. The illumination lamps for the A/C-heater
control can be serviced separately.